SHIMANO Deore XT M8000 Chainring 2 x 11 Speed Shimano XT M8000 2x chainrings BCD: Asymmetrical 64/96mm Outer Ring: Aluminum/CFRP, Plated Teeth Inner Ring: Stainless Steel Make sure to Match tooth profiles together for best performance (24-34t B; 26-36t C; or 28-38t D) Original Shimano parts guarantee that all components work perfectly for optimum performance and maximum safety and longevity.